Unigas HTLX92R Installation Manual page 22

PART II: INSTALLATION
Siemens VGD SKPx5 (Auxiliary-optional micro switch)
Actuator connection
Gas valveGas Filter (if provided)
The gas filters remove the dust particles that are present in the gas, and prevent the elements at risk (e.g.: burner valves, counters and
regulators) from becoming rapidly blocked. The filter is normally installed upstream from all the control and on-off devices.
ATTENTION: it is reccomended to install the filter with gas flow parallel to the floor in order to prevent dust fall on
the safety valve during maintenance operation.
Once the train is installed, connect the gas valves group and pressure switches plugs.
Integrated proving system (burners equipped with LME7x, LMV, LDU)
This paragraph describes the integrated proving system operation sequence:
At the beginning both the valves (EV1 and EV2) must be closed.

Test space evacuating: EV2 valve (burner side) opens and keep this position for a preset time

(td4), in order the bring the test space to ambient pressure.Test atmospheric pressure: EV2 clo-
ses and keep this position for a preset time (test time td1). The pressure switch PGCP has not to
detect a rise of pressure.
Test space filling: EV1 opens and keep this position for a preset time (td3), in order to fill the test

space.
Test gas pressure: EV1 closes and keep this position for a preset time (td2). The pressure switch

PGCP has not to detect a pressure drop down.
If all of the test phases are passed the proving system test is successful, if not a burner lockout
happens.
On LMV5x and LMV2x/3x and LME73 (except LME73.831BC), the valve proving can be parameteri-
zed to take place on startup, shutdown, or both. On LME73.831BC the valve proving is parameteri-
zed to take place on startup only.
Valve drive
Plug connection
N L 1 2
3
3
2
1
22
End of stroke
Plug connection
(only with SKPxx.xx1xx)
A Valve closed
EV1
EV2
PGCP
PS
EV2 EV1
/